<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link href="css/btn.css" rel="stylesheet"><!-- 类型 -->
</head>
<body>
    <input type="button" value="按钮">
    <input type="button" value="按钮">
    <input type="button" value="按钮">


</body>
</html>